CVE-2026-22715: VMware Workstation Privilege Escalation

CVE-2026-22715 Overview

VMWare Workstation and Fusion contain a logic flaw in the management of network packets. A malicious actor with administrative privileges on a Guest VM may be able to interrupt or intercept network connections of other Guest VMs, potentially compromising the integrity and availability of inter-VM communications within a virtualized environment.

Critical Impact

This vulnerability allows attackers with Guest VM administrative access to intercept or disrupt network traffic between other Guest VMs, potentially leading to data interception and service disruption in multi-tenant virtualized environments.

Affected Products

• VMware Workstation (versions prior to 25H2U1)
• VMware Fusion (versions prior to 25H2U1)
• VMware virtualization products with network packet management functionality

Discovery Timeline

• 2026-02-26 - CVE CVE-2026-22715 published to NVD
• 2026-02-26 - Last updated in NVD database

Technical Details for CVE-2026-22715

Vulnerability Analysis

This vulnerability stems from a logic flaw in VMware's network packet management subsystem. The flaw exists in how the hypervisor handles network packet routing and isolation between Guest VMs. Under normal operation, network traffic between Guest VMs should be strictly isolated, preventing one VM from accessing or interfering with another VM's network communications. However, due to this logic error, an attacker with administrative privileges on a Guest VM can bypass these isolation mechanisms.

The attack requires adjacent network access, meaning the attacker must be positioned within the same network segment or virtualized environment. While the attack complexity is high and no privileges are required for initial access, the impact on integrity is significant, with potential for limited availability disruption.

Root Cause

The root cause of CVE-2026-22715 is a business logic error in the network packet handling routines within VMware Workstation and Fusion. The logic flaw fails to properly enforce network isolation boundaries between Guest VMs, allowing an authenticated administrator on one Guest VM to access network traffic flows intended for other Guest VMs. This represents a failure in the network isolation design that is fundamental to secure multi-tenant virtualization.

Attack Vector

The attack vector requires adjacent network positioning and administrative access to a Guest VM. From this position, an attacker can exploit the logic flaw to:

1. Position themselves as an administrator on a compromised Guest VM
2. Leverage the network packet management vulnerability to intercept packets destined for other Guest VMs
3. Potentially modify or disrupt network connections between other Guest VMs in the environment

The vulnerability mechanism involves improper packet routing decisions within the hypervisor's virtual network stack. When certain conditions are met, the logic flaw allows packets to be redirected or duplicated to an attacker-controlled Guest VM, enabling traffic interception or denial of service conditions.

For detailed technical information regarding the exploitation mechanism, refer to the Broadcom Security Advisory #36986.

Detection Methods for CVE-2026-22715

Indicators of Compromise

• Unusual network traffic patterns between Guest VMs that indicate potential packet interception
• Unexpected network latency or connection drops affecting specific Guest VMs
• Anomalous administrative activity within Guest VMs, particularly related to network configuration
• Evidence of packet capture tools or network sniffing utilities running in Guest VMs with administrative privileges

Detection Strategies

• Monitor hypervisor logs for anomalous network packet handling events
• Implement network traffic analysis to detect unusual inter-VM communication patterns
• Deploy endpoint detection on Guest VMs to identify unauthorized network monitoring tools
• Enable verbose logging for VMware virtual network components

Monitoring Recommendations

• Configure alerts for administrative privilege usage in Guest VM environments
• Establish baseline network traffic patterns between Guest VMs to identify deviations
• Monitor for installation of network analysis tools within Guest VM environments
• Review VMware hypervisor logs for packet handling errors or anomalies

How to Mitigate CVE-2026-22715

Immediate Actions Required

• Upgrade to VMware Workstation or Fusion Version 25H2U1 as recommended by VMware
• Review and restrict administrative access to Guest VMs to minimize the attack surface
• Implement network segmentation to limit the potential impact of inter-VM traffic interception
• Audit existing Guest VM configurations for unnecessary administrative privileges

Patch Information

VMware has released a security update addressing this vulnerability. To remediate CVE-2026-22715, upgrade to VMware Workstation or Fusion Version 25H2U1. The patch corrects the logic flaw in network packet management to properly enforce network isolation between Guest VMs.

For complete patch details, review the Broadcom Security Advisory #36986.

Workarounds

• Limit administrative access to Guest VMs to trusted users only until patching is complete
• Implement strict network segmentation between Guest VMs handling sensitive traffic
• Consider using encrypted communications between Guest VMs to mitigate interception risks
• Monitor network traffic for signs of interception while awaiting patch deployment

# Configuration example - Verify VMware version after upgrade
vmrun -T ws version
# Expected output should show version 25H2U1 or later

# Review VMware Workstation configuration for network settings
cat /etc/vmware/netmap.conf